lachmann



R. A. LACIIMANN. f PULVERIZING Mm. ROLLER MID SUPPORTING STRUQTURE.

APPLICATION FILED AUGJS, l98.

R. A. LCHMANN,

PULVERLZLNG MILL ROLLER AND SUPPORLING SYRUCTURE.

APPLICAHON Ulm A116215, 19H3.

5 SHEETS--SHEET 2.

R. LACHVIANN,

PULVERZTNG NULL ROLLER AND SUPPORTING STRUCTURE.

APPLiATioN ma AUG.15.1918.

@mum m.' u, me),

5 sHEm's--SHEET 4.

II, A. I CIIIVIANN.

Rum/ERIM@ MILL ROLLER ARD SUPPORTING STRUCTURE.

IIRIQRIMI Nov. H, MIB.

APPLICATION FILED AUG,.I5, I9I8.

UNTTED STATES PATENT euries.

ROBERT A. LACHMANN, OF CHICAGO, ILLINOIS, ASSIGNOR T RAYMOND BROTHERS IMPACT PULVERIZER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF TT-T-T- NCIS.

PTTT.VERIZINGMILL ROLLER AND SUPPORTING STRUCTURE WND- SAME.

Specification o! Letters Patent.

Patented NOV. 11, 1919.

Application filed .August 15, 1918. Serial No. 250,003.

To all 'Lhom t may concern:

Be it known that I, ROBERT A. LACHMANN, a citizen ofthe UnitedStates, residinv at Chicago, in the county of Cook and Sbtate of Illinois, have invented certain new and useful Improvements in Pulverizing-Mill -Rollers and Supporting Structures for Same, of which the. following is a specification. "110 paratus, and more particularly to apparatus My invention relates to pulverizing apof theftype' in which the material operated .on .is crushed or pulverized. between a bull ,ring orequivalent element, and rollers that 15 rotate within the ring and are thrust against the-same by centrifugal force. In a centrif-l ugal impact p'iilverzing mill of -this type each roller is ordinarily fixed to a shaft andshaftl of `the mill.

this shaft o1" journal is carried in a housing pivoted to the centrally arranged driven .hastodo particularly with the construction ofthe roller shaft orvjournal and its, housing and the parts associated therewithyand the ,obgect ofthe invention, generally speaking, -is to provide certain improved arrangements in this partof the mill effecting economy and simplicity of construction, together with greater facility is assembling and dissasseinblinff and a more efiicient and economical .lubrication of the parts requiring lubrica- .tion than has been possible with the oo n- .structions heretofore employed. -A special object ofthe invention is to provide sealing rings associated with the roller and the housing, together with means for keeping the same in contact, against the tendency t0 vivbrate vertically, as to prevent waste of?J in the accompanying drawings, wherein:

.y Figure l is a longitudinal sectional view `structed in accordance 4with my in'ention; v l .l ig. l is a plan view of the -top of the housing, on a larger scale than Figli;

of a roller and its shaft and liqusing con- Fig. 3 is a detailplan view of one of the The present invention bearing rings intervening between the housing and head of the roller shaft; F 1g. 4 is a vertical sectional view illustrating the upper end of the roller shaft and parts associated therewith 5 Figs. 5 and G are sectional plan views taken on lines 5-5 and 6-6,respectively, 0f Fig. 4,

Fig.'7 1s a sectional view on line 7-7 of Fig. 5;

Fig. 84 is a vertical sectional view through the seal rings. and associated parts at tie lower end of the housing;

Figs. 9 and l0 are sectional plan views on lines 9--9 and 10-10, respectively, of Fig. 8;

Fig.'11 is a plan view ofl the top of the roller; t Fig. 12 is a View, in elevation, of the roller and associated parts at the lower end of the structure;` Fig. 13 is a detail sectional View illustrating the wedge-engagement between the roller and the revolving seal ring; i

Fig. 14 is a plan view of the' bottom of this ring;

Fig. 15 is a fragmentary, vertical sectional view of the upper end of a modified forni of housing;

Fig. 16 is a plan View of the same; and

Fig. 1.7 is a fragmentary vertical section illustrating another modified construction.

Like characters of reference designate like parts in the several figures of the drawings. Referring first to Figs. l t l-L inclusive, indicates the roller, 26 the shaft or journal of the roller, and 27 thehousing for shaft 26. The roller is rigidly secured to the shaft in any desired manner. The drawings show the following common arrangement: The lower end of the shaft is tapered at 28 and formed with a slot 29 to receive a short key 30 and a longer key 31, these keys extending' through slots 32 at opposite sides of a boss 33 which is formed integrally with the roller, the lperforation through the roller being tapered to fit the tapered p0rtion 28 of the shaft. The housing 27 is formed with an internal shoulder 31 to support the head 35 of shaft 26. The portion of the housing above the head of the shaft vforms a lubricant chamber 36 adapted to hold a supply of grease or .other suitable lubricant.

ing ai'e bushings 37, 3S, the upper bushing-37 having a flange 39 which overlaps the slioulder 34 of the housing, the lower bushing 38 having a flange 40 which lits into a recess 41 in the lower end of the housing.. Screws 42 extend through the flange 39 of the upper bushing and into the housing, the flange 39 being preferably recessed at 43 for lock washers 44. Similar screws 45 hold the lower bushing 38 in place.

interposed between the (iange 39 ofthe upper bushing 37 and thel head 35 of the roller shaft 26 are. bearing rings in, preferably, the following arrangement: Secured.

to the under side of the head by screws 46 is a ring 47 which is effectively a part of the shaft. .Arranged on the flange 39 of bushing 37 is a ring 4S (Fig. 3') formed. on its under side with a pair of diametrically arranged recesses 49 into which vextend the heads'50 of screws 42. 'The ring is also provided, referably,'on its opposite face with a pair o similar recesses 51 arrangedatright' angles to the recesses 49 lso that when the ring wears it may be reversed. lFor convenience in removing the ring from the housing its inner surface is vformed with a groovel i 52. Between the r1ngs`47 and 48 1s arranged,

preferably, 'a tloatinglring' having vertical lubricant grooves 54'on .its yinner surface and eccentric circular grooves.55 ,56, 0n its upper and lower surfaces., respectively.-

` attached thereto.V .The/internal diameter ofring 4S is preferailysomewhat larger than The internal diameter of the 'housing is in- `creased, beginning ata point just below the top of rino* 48, so that 'an annular space 57 is provided between the wall of the housing and the head 35 of the-shaft and the ring 47 the diameter of th shaft 'roviding an annular lubricant duct .58. he externa-l diameter of the floatingl ring 5 3vis preferably less than the internal iameter of the part of the housing in which the ring is arranged and the internal diameter of the rin is largerthan the diameterv of the shaft so t at ring 53 will have certain capacity for,- shifting laterally as well as "rotatinigr The heads cf :crews 4G project into the. grease chamber 36' and operate to break 'up the `grease when the shaft is rotated. Thesepreferred arrange ments provide effective means for lubricating the bearing between the upper end of the roller shaft and the housing. 'The grease from; grease chamber 36 will flow down through the annular duct 57 and will pass between'the upper surface of riirg 53 and the lower surface. of ring 47 and between the lou er surface of ring 53 and the upper surface of ring 43 into the lubricant groove 58 and .thence down between the 'bushing and the shaft.

.\ssmi:\ted with the roller 25 is a seal ring tu formed with a hub v61 ittingthe shaft 26. 'the upper surface of ring G0 is intended to bear against the under surface of seal ring G2 formed with recesses G3 on its upper surface into which project the heads G4 of the screws 45. The ring G'Zis preferably formed with a shoulder 65 and is clamped against the housing, fitting into a recess 6G therein, by an annular member (37 securedtoy the housing by bolts (5S. Ring G2 is also preferably formed with a groove (32a into which a chisel and screw driver may be inserted to facilitate removal of the ring from the housing when such removal becomes necessary. The internal diameter of ring 62 is preferably larger tlian the diameter of the shaft so as to leave a space 69 between the ring and the shaft to prevent the-ring from cutting into the shaft in case the lower end of bushing 38 wears as it fis bound to do because 'of the leverage of the roller against the bull ririg.y he ring 60 is held against ringr 62 by a heavy flat coiled spring 70 which rests upon arcuate projections 71 formed on the upper surface of roller 25 and against the under side of ring 60, thelatter being preferably formed with a 'rib 72 which the upper turn on the spring lits somewhat closely. Preferably one end lof the spring is turned down, as indicated at 73 (Fig. 12) between t o f the arcuate projections 71 so that the spring is kept from rotating. Unless the spring were made so heavy as to be practically rigid, it is inevitable that with the operation of the mill there will be a tendency on the part of the rotating seal ring 60 to vibrate away from the ring 62 against which it is intended to 'bea-r. Such vibration, if it could take place, would result in 'the wasting of the lubricant through the gap between the rings.

In "order to avoid this, I have devised'an roller produces an amount Aof friction between the roller and'seal ring 60 sufficient to prevent vibration of the ring and hold it against the ring 62. The roller is formed withone or more, preferably two, lugs 74 having inclined faces 75 and the ring (i0 is formed on its hub portion 61 with a pair of outwardly projecting lugs 76 having faces 77 adapted to bear against the faces 7 5 of the flugs oii'the `roller and slanted in corre- The inclination of the wedge surfaces'should be as near 'the angle of friction as possible.

The up Der end of the housing is closed by a cover '78 having a threaded fiange 79 adapted to screw into the housing. The housing is provided with lugs 80 and Cotter ico '105 arrangement whereby the rotation of theV Laatste pins 81 are driven through perforations in the lugs to hold the cover in place. The flange 79 of the cover and the threaded portion oit the housingr engaged thereby are preferably tapered as shown.l and the upper surface of the cover is machined so that a close lit is obtained between the cover, housing and Cotter pins. The cotter pins have a close ht in perforations of lugs 80.v These arrangements are necessary inasinuch as the housing is subjected to constant and severe vibration when the-inill is in operation. rlhe cover is intended to be` removed only in 4taking the structure apart. For lilling the grease chamber the cover is provided with .a threaded opening in which is screwed a plu 82.

The housing` is formed with a split portion 83 at one side to re sive the rock shatt 8e on which the structure is carried, the housing being;` clamped to shaft 84- by bolts in the usual inanner.

lhe structure .aoove described has several advantages over the roller journal supporting structures heretofore employed in apparatus or the type indicated. The roller shaft is ot uniform diameter, except for the head and the tapered portion which receives `the roller, instead of being of diilerent diaininto which a bore may be inserted -tor reinov ing the bushings when this becomes necessary. rthe bearings between the shaft and housing are efficiently lubricated without the waste ot Agrease which has been one of the uneeonoinieal features of :toriner apparatuses. The shaft may be readily removed trom the housing tor vthe purpose oft changing; the roller, by removing the roller and the cover at the upper end of the housing);

It is also an easy matter to renew the bean inn' rings when necessary.' Any wear on the bearing rings 1s taken up by spring 7 0. At

the saine tune the wedging arrangement between the roller and the ring G0 el'ectually l prevents the vertical vibration. ot' the seal sor ring which would be inevitable it' spring pressure alone were relied upon to keep the seal. ring against the ring on' the housing. "The shaft has a. long' bearing;` on the housing. lThe two sets ot rings, viz., those at the upper and the lower ends oit the housing, are. a considerable distance `apart so that even it the roller shaft gets out of alinen'ient under stress ot the roller against the bull rire" and dus to v.vear et' the bushings, as is e teeth by compressing spring 104.

inevitable to a certain extent, there will be little tendency ot' the coengaging ringsI to gap or wear uneveuly. The bushings when they wear on one side, as will naturally ocour, may be given a halt' turn in the housing. Ring 4:7 may be reversed when worn.

`Figs. 15 and 16 illustrate a n'iodilied form of cover construction for the upper end of the housing; that is to say, for the grease chamber. rllhe upper end ot' the housing 86 is recessed at 87 ior a renewable steel nose 8S which is secured to the housing by rivets 89. 90 is a cap internally threaded to screw on the externally threaded nose 88. rlhe cap is formed at its lower edge with a series ol teeth 91 adapted to be engaged by the corners of the heads 92 ot a pair ot screw bolts 93 slidably arranged in lugs Usl formed on opposite sides oit' the housing. The lugs are provided on vtheir upper surfaces with projections 95 adapted to bear agztinst adjacent tlat faces ot' the heads 92 of bolts 93. Each bolt is provided with Ia nut 90. Preterably loci( washers 97 are interposed between the nuts and the vunder side lugs 9&1. The thread ot' each ot the bolts 93 is cut away, as indicated at 98, and the threading of the portion 99 ot the bolt below the cut away portion 98 is mutilated so that the nut can not be turned oil' the upper threaded portion 100. By unscrewi'ng the nuts as Jr'ar as they will go the bolts may be pushed up so that their heads 92 will clear the teeth 91 on the cap. The bolts may then be given a one-eighth turn and allowed to rest on lugs 95. 1n this position of the bolts the cap 90 may be screwed on and ol".

lu Fig. 17 a somewhat ditterent arrangenient is illustrated, one side only ot the housing` being;` shown. r1`he housing, designated 101, is formed with a perforated iupr 102 through' which extends a bolt 103. a spiral springr 1011 being interposed between the under side or" the lug and a nut 105 on the bolt3 the nut being held in place by upsetting' the end of the bolt, as indicated at 106. rl`ht bolt has a head 107 at its upper end, one corner ot' which is adapted to en- .gage 'with tapered or wedgingl teeth 108 'formed on the cap 109. The bolt may be raised and its head disengaged from the l claim:

1. ln apparatus of the character described. the` combination of a roller, a strucH ture tor revoluhly supportingthe saine provided with a bearing surface7 a ring, means for yieldingly forcing the same against said bearing surface7 and means providing an 4engagement between said ring and roller whereby the revolution ot the roller checks the tendency ot the rings; to vibrate axially.

2. in apparatus of the character de scribed, the combination of a roller, a structur-e tor revolnbly supportingv the same provided with a bearing surface, a ring having a wedging engagement with the roller, and means for yieldingly forcing the ring against said bearing surface.

3.- ln apparatus ot' the character described, the combination ot' a roller, a struc.- ture for revolubly supporting the same pro-l vided with a bearing surface, a ringhaw.

ing a wedge engagement with the roller,

- and a spiral spring` interposed between said roller and 'ring which tends to force the latter against said bearing surface.

4. ln apparatus of the character described, the combination of a roller, a shaft rigid with `the roller, a housing for the shaft having a bearing surface at its lower end, a ringto bear against said surface, a spring between the roller and ring, and means providing an engagement between the ring and roller whereby the revolution or.' the roller and sha'lt cheeks the tendency ofthe ring to vibrate axially.

' 5. lnV apparatus of the character dcscribed, the combinationot` a roller, a shaft rigid with the roller, a housing for the shaft having a bearingsurt'ace at its lower end.

a ring to bear against said surface, having a wedging engagement with the roller, and

a spring between the roller andthe ring.

(i. In apparatus of the character' described, the combination ot' roller` a .shatt rigid with the roller, a housingl 'for `the shaft having a bearing surface at its lower end, a ring to bear against said surface having a wedging engagement with the roller, and

a. spiral spring between the roller and the ruw.

7. In apparatus of the ol'iaracter described, the combination of a roller, a shaft 40 rigid with the roller, a housing Vtor the shaft havinga` bearing surface provided with a lubricant chamberl above thevshat't, a ring to bear against said surface having a wedging engagement with the roller, and a. spring between the roller and ring.

S. ln apparatus ot' the character described, the combination o't' a roller, a shaft rigid with the roller, a housing for the shaft, a bearing ring secured to the lower end of the housing, a ring to bear against said first fnamed ring` having a wedging engagement with the roller, and a spring interposed between the'roller and said last mentioned ring.

9. ln apparatus of the character described, the combination ot a rol ler. a shaft rigid with the roller, a housing` for thesha'tt` a bearing ring at the lower end oi the housinghaving recesses in its upper sui-tace,

screws in said housing, the heads o'lt which: enter said recesses, an annular member adapted to engage said bearingning and clamp the same against the housing'. a ring having a wedging engagement with the roller, and a spring interposed between said last named ring and the roller.

10. In apparatus 'of the character described, the combination of a hollow housing` formed with an internal shoulder near the top, a shaft with a head supported by said shoulder, a roller fixed to the lower end o the shaft, means providing a bearing roller, and -a spring adapted to force said ring against said bearing-surface.

l1. In apparatus o the character described, the combination of a hollow housing formed with an internal shoulder near the top, a shaft with la head supported by said shoulder, a roller fixed to tha lower end of the shaft, means providing a bearing surface at the lower end of the housing, a ring having wedging engagement with the roller, a spring adapted to force said ring against said bearing surface, and bushings extending into opposite endsl of the housing between the saine and said shaft.

12. In apparatus of the character described, the combination or' a hollow housing formed with'au internal shoulder near the top, a shaft with a head supportedby said shoulder, a roller iixed to the lower end of the shaft, means providing a bearing sur- Jface at the lower end of the housing, a ring having wedging engagement with the roller, a spring` adapted to force said ring against said bearingsuri'ace, and bearing rings inteiposed between said shoulder and the head of the shaft.

13. 1n apparatus of the character de-.

scribed, the eombin ation oit' a hollow housing formed with an internal shoulder near the top, a shaft with a head supported by said shoulder, a roller fixed to the lower end of the shaft, means providing a bearing surface at the lower end ot the housing, a ring having wedging` engz'igement with the, roller. a spring adapted to force said ring against said bearing surface. a bearing ring ixed to4 the under side or', the head of the shaft, a ring supported on the shoulder of the housing and non-rotatable with rcspect thereto, and a floating ring between the last mentioned two rings.

1l. In appa `atus of the character described, the combination ot a hollow housing formed with an internal shoulder near the top, a shaft with a head supported by said shoulder, a roller iXed 'to the lower end of the shaft, means providinga bearing sur- -t'ace at the lower end of the housing, a ring having wedging engagement. with the roller, a spring adapted to force said ring` against said bearing surface, a bearing ringv fixed to the under side of the head of the sha-ft, a ring supported on the shoulder of the housing and non-rotatable with respect 4'surface at the lower end of the housing, a a ring having wedglng engagement wlth the thereto, and a floating ring between the last mentioned two rings, said floating ring having eccentric lubricant grooves on its upper and lower surfaces.

' 15.1n apparatus of the character described, the combination of a hollow housing formed with an internal shoulder near the'top, a shaft with ai head supported by said shoulder, a roller fixed to the lower end of the shaft, mea-ns providing a bearing sur- ,face at the 1Jwer end of the housing, a ring having wedging engagement with the roller, a springl adapted to force said ring against said bearing surface, a bearing ring fixed to the under side of the head of the shaft, a ring supported on the shoulder of the housing and non-rotatable with respect thereto, and a floating ring between the last mentioned two rings, the internal diameter of the floating ring being greater than the diameter of the shaft.

16. 1n apparatus of the character described, the combination of a hollow housing formed with an internal shoulder near the top, a shaft with a head supported by sai-d shoulder, a roller fixed to the lower end of the shaft, means providing a bearing sur- `face` at the lower end of the housing, a ring having wedging engagement with the roller, a spring .adapted to force said ring against said bearing surface, a bearing ring fixed to the under side of the head of the shaft, a ring supported on the shoulder of the housing and non-rotatable with respect thereto, and a Hoating ring between the last mentioned two rings, the internal diameter of the fioating ring being greater than the diameter of the shaft, and its external diameter being less than the corresponding internal diameter of the housing.

17. In apparatus of the character described, the'combination of a hollow housing formed with an internal shoulder' near the top, a shaft with a head supported by said shoulder, a roller fixed vto the lower end of the shaft, means providing a bearing surface at the lower end of the housing, a ring having wedging'engagement with the roller, a spring adapted to force said ring against said bearing surface, a bearing ring fixed to the under side of the head of said shaft, said head and ring having a diameter less than the Jcorresponding internal diameter of the housing, and a ring seated on the shoulder of the housing and nonfrota! table with respect thereto, the internal diameter of which is greater than the corresponding diameter of said shaft.

18. Inf apparatus ofthe character described, the combination of a hollow housing formed with an internal shoulder near the top, a shaft with a head supported by said shoulder, a roller fixed to the lower end of the shaft, means providing abearing surface at the lower end of the housing, a ring having wedging engagement with the roller, a spring adapted to force said ring against said bearing surface, a bearing ring fixed to the under side of the head of said shaft, said head and ring having a diameter less than the corresponding internal diameter of the housing, a ring seated on the shoulder of the housing and non-rotatable with respect thereto, the internal diameter of which is greater than the corresponding diameter of said shaft, and a Hoating ring between said last mentioned rings, the internal diameter of which is greater than the diameter of the shaft.

19. In apparatus of the character described, the combination of` a housinghaving an internal shoulder at its upper end, a shaft with a head adapted to be supported by said shoulder, a roller on the lower end of the shaft, bushings which extend into thel housing from opposite ends between' `the same and the shaft and provided with flanges, the flange on the upper.bushing ,shaft having a head supported in said housing with the lower end projecting there from, a roller on the lower end of the shaft, means onthe lower end of the housing providing a bearing surface, a ring on the shaft between the lower end of the housing and roller, provided with a hub` formed with a projecting lug having an inclined face, a lug on the roller having a-n inclined face corresponding to the face of the lug on the ring, and a spiral spring interposed between said ring and the roller.

2l. In apparatus of the Character 'described, the combi-nation of a housing, a shaft-having a head supported in said housing with the lower end projecting therefrom, a roller on the lower end of the shaft, means on the lower end ofthe housing providing a bearing surface, a ring on the shaft between the lower end of the housing and roller, provided with a hub formed with a vprojecting lug having an inclined face, a lug on the roller having an inclined face corresponding to the face of the lug on tle ring, and a spiral spring interposed between said ring and the roller, the roller being formed Ywith arcuate projections for said springs to rest upon and the end of the spring being` bent down so as to engage one of said projections, for the purpose described.

22. In apparatus of the' character def4 sgjribcd, the combination of a housing having an internal shoulder7 a shaft having a head adapted to besupported by said sh0ulder, a roller on the lower end of the shaft, screws `which project 'from said shoulder, and a ring arranged between the shoulder and head of the shaft having recesses on opposite faces for said screws so that the position of the ring may be reversed.

In apparatus of the character described, the combination of a housing havingan internal shoulder, a cover Which closes the upper end of the housing having a filling opening and a plugl to close the saine, a shaft having a head adapted to beY supported by said shoulder on the housing, bearing rings interposed between said head and shoulder, a bearing ring and means for securing it to the lower end of the housing, a roller on the lower end of the shaft, a ring` on thevshaft between the roller and the housing having a Wedging engagement with the roller, and a spring interpoed ben tween said last named ring and the roller.

2%.111 apparatus of the class described, the combination of a roller, a shaft rigid with the roller, a housing for the shaft, a bearing ring at the lower cndof the housing. means to secure the ring` to the'housing, a ring to bear against saidiirst named ring having a Wedging engagement with the roller and a spring interposed between the roller and said last rino".

n apparatus of the character described, the combination of a hollowT honsing` formed With an internal shoulder near the top, a shaft with a head supported by said shoulder, a roller fixed to the lower end of the shaft, means providing a bearinO' surface at the lower end of the housing, a ring having Wedging engagement with the roller, a spring adapted to .force said ring against said bearing surface, a bearing ring fixed to the lunder side of the head of the shaft, and a ring supported on the shoulder' of the housing and nonrotatable with respect thereto.

ROBERT A. LACHMANN. 

